/Engine/Plugins/Media/ElectraSubtitles/Source/ElectraSubtitles/Public/IElectraSubtitleDecoder.h
Returns a time offset at which streamed subtitles should be delivered ahead of their actual timestamp (if they are available earlier)
[Electra::FTimeValue](API\Plugins\ElectraBase\FTimeValue) GetStreamedDeliveryTimeOffset()